Is it permissible to collect exercises and questions from various books and resell them to students, while citing the sources, or to rephrase and categorize exams and sell them? Is the profit from this permissible? And is it necessary to seek permission from the authors of the books, especially if it is not stated on them "copyright reserved"?
If the authors of the books do not prevent their publication, then it is permissible to benefit from them and the earnings are lawful. However, if they do prevent it, then it is not permissible to transmit from them without their permission, whether the sources are mentioned or not, because that is an infringement on the authors' rights.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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